Circuit and method for controlling metal ceramic heating element through bidirectional triode thyristor

Abstract

The invention relates to the technical field of electricity and triode thyristors, in particular to a circuit and method for controlling a metal ceramic heating element through a bidirectional triode thyristor. The circuit comprises a U1 which is a dedicated temperature-controlled integrated circuit KC-0.5, 80C51, LM3911, or an integrated circuit with the functions of signal collecting, computing, output, voltage stabilizing, handles input and display output, the bidirectional triode thyristor, the metal ceramic heating element, a resistor and a capacitor. The circuit is characterized in that the circuit is formed by connecting the dedicated temperature-controlled integrated circuit U1, the bidirectional triode thyristor Q1, the metal ceramic heating element R5, a sampling resistor, a negative power source supply circuit, an alternating current clock sampling circuit and an alternating current voltage sampling circuit. Compared with the prior art, the circuit and method for controlling the metal ceramic heating element through the bidirectional triode thyristor have the advantages that an alternating current signal is input into a CLK pin of the integrated circuit U1, the alternating current clock sampling circuit is arranged inside the integrated circuit U1 to be used for computing the precise zero crossing point of the alternating current and measuring the alternating current voltage value, a GATE pin outputs the negative voltage pulse at the zero crossing point of the alternating current when the heating element is heated to make the bidirectional triode thyristor be turned on, so that stable and reliable temperature control is achieved.

Description

[technical field] [0001] The invention relates to the technical fields of electricity and silicon controlled rectifiers, and specifically relates to a circuit and a method for controlling a cermet heating element by a bidirectional silicon controlled silicon. [Background technique] [0002] MCH refers to the ceramic heating element that is made by printing metal tungsten or molybdenum manganese slurry on the ceramic cast body, after hot pressing lamination, and then under the protection of hydrogen atmosphere at 1600 ℃, the ceramic heating element is co-sintered with ceramic and metal. Corrosion, high temperature resistance, long life, high efficiency and energy saving, uniform temperature, good thermal conductivity, fast thermal compensation, etc., and does not contain harmful substances such as lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers, etc. EU RoHS and other environmental requirements. MCH (metal-ceramic heating...

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Problems solved by technology

[0004] The existing Chinese patent No. 200910194722.4 discloses a circuit for controlling the MCH heating element with bidirectional thyristor. After reasoning and actual testing, the bidirectional in the circuit cannot be triggered normally and cannot work normally.

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